The leak at the facility near Porter Ranch lasted nearly four months and is considered the worst natural gas leak in U.S. history.

Toll Brothers says its development of the Porter Ranch area and the sale of new homes came to a halt after the 2015-16 leak and more than 20 homebuyers who were already under contract canceled their purchases.

The builder says that in the six-month period before the leak to the 6 months after it, its net home sales went from 74 to negative 1 with the cancellations.

The suit claims SoCal Gas knew as far back as 2008 that the wells were in danger of a blowout. And rather than work to prevent one, the company pumped even more gas into the wells at a faster rate.